/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.lvyh.lightframe.tracer.starter.springmvc;

import com.google.common.base.Splitter;
import com.lvyh.lightframe.tracer.core.common.AbstractTracer;
import com.lvyh.lightframe.tracer.core.common.SimpleTracerConfiguration;
import com.lvyh.lightframe.tracer.core.samplers.TraceSamplerConfig;
import com.lvyh.lightframe.tracer.plugin.springmvc.SpringMvcTracer;
import com.lvyh.lightframe.tracer.plugin.springmvc.SpringMvcTracerFilter;
import com.lvyh.lightframe.tracer.starter.registry.DynamicBeanRegister;
import com.lvyh.lightframe.tracer.starter.util.SpringContextUtils;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.EnvironmentAware;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.core.Ordered;
import org.springframework.core.env.Environment;

import java.util.List;

@Configuration
@Import({DynamicBeanRegister.class})
@ConditionalOnProperty(prefix = "tracer.springmvc", value = "enabled", havingValue = "true")
public class SpringMvcAutoConfiguration implements EnvironmentAware {
    private static final Logger logger = LoggerFactory.getLogger(SpringMvcAutoConfiguration.class);

    private Environment env;

    @Bean
    public FilterRegistrationBean filterRegistrationBean() {
        TraceSamplerConfig traceSamplerConfig = SpringContextUtils.getBean(TraceSamplerConfig.class);
        AbstractTracer springMvcTracer = SpringMvcTracer.getSpringMvcTracer(traceSamplerConfig);

        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
        SpringMvcTracerFilter filter = new SpringMvcTracerFilter(springMvcTracer);
        filterRegistrationBean.setFilter(filter);

        String urlPattern = env.getProperty("tracer.springmvc.filter.url.pattern");
        if (StringUtils.isEmpty(urlPattern)) {
            filterRegistrationBean.addUrlPatterns("/*");
        } else {
            List<String> urlPatterns = Splitter.on(",").trimResults().splitToList(urlPattern);
            filterRegistrationBean.setUrlPatterns(urlPatterns);
        }
        filterRegistrationBean.setName(filter.getFilterName());
        filterRegistrationBean.setAsyncSupported(true);
        filterRegistrationBean.setOrder(Ordered.HIGHEST_PRECEDENCE + 1);

        logger.info("[SpringMvcAutoConfiguration] Init springmvc filter success.");
        return filterRegistrationBean;
    }

    @Override
    public void setEnvironment(Environment environment) {
        this.env = environment;
        SimpleTracerConfiguration.setApplicationName(getApplicationName());
    }

    private String getApplicationName() {
        String applicationName = this.env.getProperty("spring.application.name");
        return applicationName;
    }

}